The blue korhaan or blue bustard (Eupodotis caerulescens) is a species of bird in the family Otididae which is native to South Africa. Its call is a series of frog-like croaks, usually uttered in flight. Its natural habitat is plateau grassland, dry shrubland, arable land and pastureland. Its preferred habitat is one with short grassland and flat topography. Korhaans are ground-dwelling birds with sturdy bodies, large heads and long necks, long legs and short toes. The blue korhaan is a fairly large bird growing to a total length of 50 to 58 cm. The forehead and crown are black, while the sides of the head are white. In males, the back, wings and tail are brown but the neck, throat, breast and belly are bluish-grey. Females are similar in colouring but the neck and underparts are a duller grey and the ear coverts are buff. The legs and feet are yellow. The voice is a series of throaty "krok-kau"s, often heard around dawn and uttered during flight.